[tracing] Sanitize process memory dumps for background mode

base/trace_event/memory_dump_provider.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_TRACE_EVENT_MEMORY_DUMP_PROVIDER_H_
 #define BASE_TRACE_EVENT_MEMORY_DUMP_PROVIDER_H_
 
 #include "base/base_export.h"
 #include "base/macros.h"
 #include "base/process/process_handle.h"
 #include "base/trace_event/memory_dump_request_args.h"
 
 namespace base {
 namespace trace_event {
 
 class ProcessMemoryDump;
 
-// Args passed to OnMemoryDump(). This is to avoid rewriting all the subclasses
-// in the codebase when extending the MemoryDumpProvider API.
-struct MemoryDumpArgs {
-  MemoryDumpLevelOfDetail level_of_detail;
-};
-
 // The contract interface that memory dump providers must implement.
 class BASE_EXPORT MemoryDumpProvider {
  public:
   // Optional arguments for MemoryDumpManager::RegisterDumpProvider().
   struct Options {
     Options()
         : target_pid(kNullProcessId),
           dumps_on_single_thread_task_runner(false) {}
 
     // If the dump provider generates dumps on behalf of another process,
@@ skipping 27 matching lines @@
  protected:
   MemoryDumpProvider() {}
 
   DISALLOW_COPY_AND_ASSIGN(MemoryDumpProvider);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_MEMORY_DUMP_PROVIDER_H_